Be careful when using this, as users may not expect this functionality.
If there’s only one match for a particular search query, you can save users the hassle of clicking by simply redirecting them to the page/post.
add_action('template_redirect', 'single_result'); function single_result() { if (is_search()) { global $wp_query; if ( $wp_query->post_count == 1 && $wp_query->max_num_pages == 1 ) { wp_redirect( get_permalink( $wp_query->posts[0]->ID ) ); exit; } } }